If you have active acne with oily sensitive skin i recommend the product, you do notice the difference within few weeks. Level 1 and 2 easy to apply, step three is slightly burning /sensitive. Overall only product that actually worked on active acne this was recommend by dermatologist having been on medicine which cleared up but came back. It is expensive however does the job, do a patch test also see a dermatologist first and don't forget to apply sun cream it is a must